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As production of the fuel-efficient 2012 Chevrolet Sonic and Buick Verano begins this fall at the General Motors Orion Assembly Plant, 40 percent of the energy required to build the vehicles will come from burning gas from a nearby landfill - GM announced Thursday, May 19, 2011 in Lake Orion, Michigan. Lighting system upgrades will save more than 5,944 megawatts of electricity per year and $430,000 while also cutting carbon monoxide by 3,676 metric tons. (Photo by Steve Fecht for General Motors)